Cobalt(II) chloride catalysed oxidative degradation of poly(ethylene oxide) by a short wavelength UV-radiation

Polymer ◽  
1999 ◽  
Vol 40 (21) ◽  
pp. 5781-5791 ◽  
Author(s):  
A. Kamińska ◽  
H. Kaczmarek ◽  
J. Kowalonek
Keyword(s):  
Ethylene Oxide ◽  
Uv Radiation ◽  
Short Wavelength ◽  
Oxidative Degradation ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Photo-oxidative degradation of poly(ethylene oxide)-copper chloride complexes

Polymer ◽  
1996 ◽  
Vol 37 (18) ◽  
pp. 4061-4068 ◽  
Author(s):  
H. Kaczmarek ◽  
A. Kamińska ◽  
L.Å. Lindén ◽  
J.F. Rabek
Keyword(s):  
Ethylene Oxide ◽  
Copper Chloride ◽  
Oxidative Degradation ◽  
Chloride Complexes ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

The influence of transition metal salts on photo-oxidative degradation of poly(ethylene oxide)

2001 ◽  
Vol 73 (3) ◽  
pp. 437-441 ◽  
Author(s):  
Halina Kaczmarek ◽  
Alina Sionkowska ◽  
Alina Kamińska ◽  
Jolanta Kowalonek ◽  
Małgorzata Świątek ◽  
...  
Keyword(s):  
Transition Metal ◽  
Ethylene Oxide ◽  
Oxidative Degradation ◽  
Metal Salts ◽  
Transition Metal Salts ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

scholarly journals NBT-Pluronic F-127 Hydrogels Printed on Flat Textiles as UV Radiation Sensors

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3435
Author(s):  
Elżbieta Sąsiadek ◽  
Malwina Jaszczak ◽  
Joanna Skwarek ◽  
Marek Kozicki
Keyword(s):  
Ethylene Oxide ◽  
Uv Radiation ◽  
Absorbed Dose ◽  
Woven Fabrics ◽  
Tetrazolium Chloride ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Surface Modified ◽  
Poly Propylene ◽  
Radiation Sensors

This work reports on the surface-modified woven fabrics for use as UV radiation sensors. The cotton and polyamide fabrics were printed with radiochromic hydrogels using a screen-printing method. The hydrogels used as a printing paste were composed of water, poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (Pluronic F-127) as a gel matrix and nitro blue tetrazolium chloride as a radiation-sensitive compound. The development of the hydrogels’ colour occurs after exposure to UV radiation and its intensity increases with increasing absorbed dose. The features of the NBT-Pluronic F-127 radiochromic hydrogels and the fabrics printed with the hydrogels were examined using UV-Vis and reflectance spectrophotometry as well as scanning electron microscopy (SEM). The effects of NBT concentration and UV radiation type (UVA, UVB, UVC) on dose responses of the hydrogels and printed fabrics were also examined. The results obtained reveal that the fabrics printed with NBT-Pluronic F-127 hydrogels can be potentially useful as UV radiation sensors.

Photo-Oxidative Degradation Polyethylene Containing Titanium Dioxide and Poly(Ethylene Oxide)

2017 ◽  
Vol 751 ◽  
pp. 796-800 ◽  
Author(s):  
Tawat Soitong ◽  
Supattra Wongsaenmai
Keyword(s):  
Weight Loss ◽  
Titanium Dioxide ◽  
Ethylene Oxide ◽  
Composite Films ◽  
Oxidative Degradation ◽  
Ambient Air ◽  
High Photocatalytic Activity ◽  
Melt Mixing ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Biodegradable Polyethylene (PE) may be used in the fabrication of plastic films which can replace common films prepared from nondegradable polymers. A photodegradable polyethylene composite film was prepared by mixing titanium dioxide/poly(ethylene oxide) into the PE matrix (PE/TiO2/PEO). The composites films were prepared using 0-3 wt.% of TiO2 and 0-10 wt.% of PEO by melt mixing. It was then compression molded in to films at 180 ◦C. The photo-degradation test was performed under 400 W UV lamp in the ambient air. The resulting composite materials were investigated by the Fourier transform infrared spectra (FTIR), Scanning electron microscope (SEM), weight loss monitoring, and Differential scanning calorimeter (DSC). The PE/TiO2/PEO composites film showed a high photocatalytic activity, the weight loss rate of it is about two times higher than that of PE/TiO2 film and ten times higher than that of neat PE film. The FTIR spectra films after UV irradiation showed that the carbonyl peak intensity for composite films the intensity is greater than that of neat PE film. The degraded PEO produced an acid and an aldehyde, which were able to facilitate PE degradation and the addition of PEO/TiO2 brought about the facilitative effect of the PE degradation.

scholarly journals Thermal and microwave-assisted oxidative degradation of poly(ethylene oxide)

2005 ◽  
Vol 96 (6) ◽  
pp. 2090-2096 ◽  
Author(s):  
S. P. Vijayalakshmi ◽  
J. Chakraborty ◽  
Giridhar Madras
Keyword(s):  
Ethylene Oxide ◽  
Oxidative Degradation ◽  
Microwave Assisted ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

The Structure of Radiation Cross-Linked Poly (ethylene oxide) Gels

1971 ◽  
Vol 29 ◽  
pp. 76-77
Author(s):  
C. E. Cluthe ◽  
G. G. Cocks
Keyword(s):  
Molecular Weight ◽  
Ethylene Oxide ◽  
Parallel Plate ◽  
Average Molecular Weight ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Nitrogen Gas ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Initial Viscosity

Aqueous solutions of a 1 weight-per cent poly (ethylene oxide) (PEO) were degassed under vacuum, transferred to a parallel plate viscometer under a nitrogen gas blanket, and exposed to Co60 gamma radiation. The Co60 source was rated at 4000 curies, and the dose ratewas 3.8x105 rads/hr. The poly (ethylene oxide) employed in the irradiations had an initial viscosity average molecular weight of 2.1 x 106.The solutions were gelled by a free radical reaction with dosages ranging from 5x104 rads to 4.8x106 rads.

Preparation of Organized Mesoporous Silica from Sodium Metasilicate Solutions in Alkaline Medium Using Nonionic Surfactants

2003 ◽  
Vol 68 (10) ◽  
pp. 2019-2031 ◽  
Author(s):  
Markéta Zukalová ◽  
Jiří Rathouský ◽  
Arnošt Zukal
Keyword(s):  
Mesoporous Silica ◽  
Ethylene Oxide ◽  
Sodium Metasilicate ◽  
Spherical Particles ◽  
Structure Directing Agent ◽  
Inorganic Species ◽  
Poly Ethylene Oxide ◽  
Acidic Conditions ◽  
Poly Ethylene ◽  
Hydrolysis Of

A new procedure has been developed, which is based on homogeneous precipitation of organized mesoporous silica from an aqueous solution of sodium metasilicate and a nonionic poly(ethylene oxide) surfactant serving as a structure-directing agent. The decrease in pH, which induces the polycondensation of silica, is achieved by hydrolysis of ethyl acetate. Owing to the complexation of Na+ cations by poly(ethylene oxide) segments, assembling of the mesostructure appears to occur under electrostatic control by the S0Na+I- pathway, where S0 and I- are surfactant and inorganic species, respectively. As the complexation of Na+ cations causes extended conformation of poly(ethylene oxide) segments, the pore size and pore volume of organized mesoporous silica increase in comparison with materials prepared under neutral or acidic conditions. The assembling of particles can be fully separated from their solidification, which results in the formation of highly regular spherical particles of mesoporous silica.

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